Cellular interactions of covR/S mutant group A Streptococci
نویسندگان
چکیده
منابع مشابه
The Cellular Antigens of Group a Streptococci
The immunoelectrophoretic characteristics of the known cellular antigens of serotype 17, Group A streptococci have been presented. These include C, M, T, and polyglycerophosphate. In addition, three hitherto undescribed antigens of serotype 17 have been encountered. The F antigen occurs in most serotype 17 strains, has a faster electrophoretic mobility than M, appears in acid, distilled water, ...
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The hemolytic properties of extracts of sonic disrupted group A streptococcal cells have been described previously by Schwab (1956a, 1956b). After a single intradermal injection into rabbits, similar cellular extracts have been observed to induce chronic remittent nodular skin lesions associated with marked changes in the dermal connective tissue. It is the purpose of this communication to desc...
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Two methods of typing group A hemolytic streptococci have been described: slide agglutination and anti-M precipitin tests. The first, developed by Griffith (1), is more extensively used. I t has the distinct advantages of requiring small amounts of serum and culture, and of a quick reaction time when all conditions are favorable. I t has certain disadvantages: The granular growth of some strain...
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this study was undertaken in order to ascertain the carrier rate of group a hemolytic streptococci in the throats of pupils in selected schools of tehran, and to evaluate the role of socio-economical factors on carrier state. during the period of six months, 7020 children and adolescents, aged 10 to 17, were studied. these pupils were visited at their schools and their socio-economical level wa...
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In a clinical trial a new pyrrolidonyl-β-naphthylamide (PYR) hydrolysis test was compared with the bacitracin disk susceptibility test for accuracy in the presumptive identification of group A streptococci (GAS). Among 128 isolates of beta-hemolytic streptococci 93 group A isolates were found. The sensitivity of the PYR and bacitracin tests were similar (98.9%), but the bacitracin test had ...
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ژورنال
عنوان ژورنال: Microbes and Infection
سال: 2018
ISSN: 1286-4579
DOI: 10.1016/j.micinf.2017.12.009